style: add type hints and aliases

[vil02]

Related to #201.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

100.0% Coverage
0.0% Duplication

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00%	✅ 100.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (6898677)	493	493	100.00%
Head commit (c12e663)	497 (+4)	497 (+4)	100.00% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#208)	16	16	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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_{You may notice some variations in coverage metrics with the latest Coverage engine update. For more details, visit the documentation}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6898677) 100.00% compared to head (c12e663) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #208   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           18        18           
  Lines          493       497    +4     
  Branches        43        43           
=========================================
+ Hits           493       497    +4     

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